From Tibet to Tanzania to Toronto, no matter where you go you'll see someone talking on his or her cell phone. These days, cell phones provide an incredible array of functions, and new ones are being added at a breakneck pace. Depending on the cell phone model, you can:

You might hear terms like 4G, LTE, GSM and CDMA thrown around and wonder what they refer to. At its most basic, a cell phone is a radio -- an extremely sophisticated radio, but a radio nonetheless. We'll show you what we mean.